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Cleanup: pass gasmix by value

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In a previous commit, the get_gasmix_* functions were changed to
return by value. For consistency, also pass gasmix by value.

Note that on common 64-bit platforms struct gasmix is the size
of a pointer [2 * 32 bit vs. 64 bit] and therefore uses the
same space on the stack. On 32-bit platforms, the stack use
is probably doubled, but in return a dereference is avoided.

Supporting arbitrary gas-mixes (H2, Ar, ...) will be such an
invasive change that going back to pointers is probably the
least of our worries.

This commit is a step in const-ifying input parameters (passing
by value is the ultimate way of signaling that the input parameter
will not be changed [unless there are references to said parameter]).

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-08-16 19:10:10 +02:00 • committed by Dirk Hohndel
parent 5c4569247a
commit 360f07e453
28 changed files with 214 additions and 215 deletions
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35
core/profile.c
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@ -333,7 +333,7 @@ int get_cylinder_index(struct dive *dive, struct event *ev)
fprintf(stderr, "Still looking up cylinder based on gas mix in get_cylinder_index()!\n");
mix = get_gasmix_from_event(dive, ev);
best = find_best_gasmix_match(&mix, dive->cylinder, 0);
best = find_best_gasmix_match(mix, dive->cylinder, 0);
return best < 0 ? 0 : best;
}
@ -760,14 +760,14 @@ static void fill_sac(struct dive *dive, struct plot_info *pi, int idx, unsigned
/*
* Create a bitmap of cylinders that match our current gasmix
*/
static unsigned int matching_gases(struct dive *dive, struct gasmix *gasmix)
static unsigned int matching_gases(struct dive *dive, struct gasmix gasmix)
{
int i;
unsigned int gases = 0;
for (i = 0; i < MAX_CYLINDERS; i++) {
cylinder_t *cyl = dive->cylinder + i;
if (same_gasmix(gasmix, &cyl->gasmix))
if (same_gasmix(gasmix, cyl->gasmix))
gases |= 1 << i;
}
return gases;
@ -781,10 +781,10 @@ static void calculate_sac(struct dive *dive, struct divecomputer *dc, struct plo
for (int i = 0; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
struct gasmix newmix = get_gasmix(dive, dc, entry->sec, &ev, &gasmix);
if (!same_gasmix(&newmix, &gasmix)) {
struct gasmix newmix = get_gasmix(dive, dc, entry->sec, &ev, gasmix);
if (!same_gasmix(newmix, gasmix)) {
gasmix = newmix;
gases = matching_gases(dive, &newmix);
gases = matching_gases(dive, newmix);
}
fill_sac(dive, pi, i, gases);
@ -907,7 +907,7 @@ static void setup_gas_sensor_pressure(struct dive *dive, struct divecomputer *dc
#ifndef SUBSURFACE_MOBILE
/* calculate DECO STOP / TTS / NDL */
static void calculate_ndl_tts(struct deco_state *ds, struct dive *dive, struct plot_data *entry, struct gasmix *gasmix, double surface_pressure,enum divemode_t divemode)
static void calculate_ndl_tts(struct deco_state *ds, struct dive *dive, struct plot_data *entry, struct gasmix gasmix, double surface_pressure,enum divemode_t divemode)
{
/* FIXME: This should be configurable */
/* ascent speed up to first deco stop */
@ -1026,7 +1026,7 @@ void calculate_deco_information(struct deco_state *ds, struct deco_state *planne
int time_stepsize = 20;
current_divemode = get_current_divemode(dc, entry->sec, &evd, &current_divemode);
gasmix = get_gasmix(dive, dc, t1, &ev, &gasmix);
gasmix = get_gasmix(dive, dc, t1, &ev, gasmix);
entry->ambpressure = depth_to_bar(entry->depth, dive);
entry->gfline = get_gf(ds, entry->ambpressure, dive) * (100.0 - AMB_PERCENTAGE) + AMB_PERCENTAGE;
if (t0 > t1) {
@ -1040,7 +1040,7 @@ void calculate_deco_information(struct deco_state *ds, struct deco_state *planne
for (j = t0 + time_stepsize; j <= t1; j += time_stepsize) {
int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0);
add_segment(ds, depth_to_bar(depth, dive),
&gasmix, time_stepsize, entry->o2pressure.mbar, current_divemode, entry->sac);
gasmix, time_stepsize, entry->o2pressure.mbar, current_divemode, entry->sac);
entry->icd_warning = ds->icd_warning;
if ((t1 - j < time_stepsize) && (j < t1))
time_stepsize = t1 - j;
@ -1115,7 +1115,7 @@ void calculate_deco_information(struct deco_state *ds, struct deco_state *planne
/* We are going to mess up deco state, so store it for later restore */
struct deco_state *cache_data = NULL;
cache_deco_state(ds, &cache_data);
calculate_ndl_tts(ds, dive, entry, &gasmix, surface_pressure, current_divemode);
calculate_ndl_tts(ds, dive, entry, gasmix, surface_pressure, current_divemode);
if (decoMode() == VPMB && !in_planner() && i == pi->nr - 1)
final_tts = entry->tts_calc;
/* Restore "real" deco state for next real time step */
@ -1213,15 +1213,15 @@ static void calculate_gas_information_new(struct dive *dive, struct divecomputer
int fn2, fhe;
struct plot_data *entry = pi->entry + i;
gasmix = get_gasmix(dive, dc, entry->sec, &evg, &gasmix);
gasmix = get_gasmix(dive, dc, entry->sec, &evg, gasmix);
amb_pressure = depth_to_bar(entry->depth, dive);
current_divemode = get_current_divemode(dc, entry->sec, &evd, &current_divemode);
fill_pressures(&entry->pressures, amb_pressure, &gasmix, (current_divemode == OC) ? 0.0 : entry->o2pressure.mbar / 1000.0, current_divemode);
fill_pressures(&entry->pressures, amb_pressure, gasmix, (current_divemode == OC) ? 0.0 : entry->o2pressure.mbar / 1000.0, current_divemode);
fn2 = (int)(1000.0 * entry->pressures.n2 / amb_pressure);
fhe = (int)(1000.0 * entry->pressures.he / amb_pressure);
if (dc->divemode == PSCR) { // OC pO2 is calulated for PSCR with or without external PO2 monitoring.
struct gasmix gasmix2 = get_gasmix(dive, dc, entry->sec, &evg, &gasmix);
entry->scr_OC_pO2.mbar = (int) depth_to_mbar(entry->depth, dive) * get_o2(&gasmix2) / 1000;
struct gasmix gasmix2 = get_gasmix(dive, dc, entry->sec, &evg, gasmix);
entry->scr_OC_pO2.mbar = (int) depth_to_mbar(entry->depth, dive) * get_o2(gasmix2) / 1000;
}
/* Calculate MOD, EAD, END and EADD based on partial pressures calculated before
@ -1229,7 +1229,7 @@ static void calculate_gas_information_new(struct dive *dive, struct divecomputer
* END takes O₂ + N₂ (air) into account ("Narcotic" for trimix dives)
* EAD just uses N₂ ("Air" for nitrox dives) */
pressure_t modpO2 = { .mbar = (int)(prefs.modpO2 * 1000) };
entry->mod = (double)gas_mod(&gasmix, modpO2, dive, 1).mm;
entry->mod = (double)gas_mod(gasmix, modpO2, dive, 1).mm;
entry->end = (entry->depth + 10000) * (1000 - fhe) / 1000.0 - 10000;
entry->ead = (entry->depth + 10000) * fn2 / (double)N2_IN_AIR - 10000;
entry->eadd = (entry->depth + 10000) *
@ -1237,7 +1237,7 @@ static void calculate_gas_information_new(struct dive *dive, struct divecomputer
entry->pressures.n2 / amb_pressure * N2_DENSITY +
entry->pressures.he / amb_pressure * HE_DENSITY) /
(O2_IN_AIR * O2_DENSITY + N2_IN_AIR * N2_DENSITY) * 1000 - 10000;
entry->density = gas_density(&gasmix, depth_to_mbar(entry->depth, dive));
entry->density = gas_density(gasmix, depth_to_mbar(entry->depth, dive));
if (entry->mod < 0)
entry->mod = 0;
if (entry->ead < 0)
@ -1387,11 +1387,10 @@ static void plot_string(struct plot_info *pi, struct plot_data *entry, struct me
depthvalue = get_depth_units(entry->depth, NULL, &depth_unit);
put_format_loc(b, translate("gettextFromC", "@: %d:%02d\nD: %.1f%s\n"), FRACTION(entry->sec, 60), depthvalue, depth_unit);
for (cyl = 0; cyl < MAX_CYLINDERS; cyl++) {
struct gasmix *mix;
int mbar = GET_PRESSURE(entry, cyl);
if (!mbar)
continue;
mix = &displayed_dive.cylinder[cyl].gasmix;
struct gasmix mix = displayed_dive.cylinder[cyl].gasmix;
pressurevalue = get_pressure_units(mbar, &pressure_unit);
put_format_loc(b, translate("gettextFromC", "P: %d%s (%s)\n"), pressurevalue, pressure_unit, gasname(mix));
}